I'm playing the original Pirates and using my keyboard but most of the controls in the manual are for joystick mode. The manual says to see the seperate Captain's Broadsheet for keyboard controls but I can'tfind the Captain's Broadsheet in the documentation. Does anyone know where it is?

The Captain's Broadsheet was a second, much thinner technical manual in black and white text. I know that, because i own the original version.

All the controls can be used by using the Numpad keys.
Basically you will need Numpad 1, 4, 7 for sword fight attack, 2. 5. 8 for defense and if i remember correctly, 3, 6, 9 for drawback.

I not sure at which position the Numlock key must be, thus you should try both positions to test which one works.